RetroMusicPlayer/app/src/main/res/layout/fragment_library.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/mainContent"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appBarLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:liftOnScroll="true">

        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_scrollFlags="scroll|enterAlways">

            <androidx.appcompat.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="?attr/colorSurface"
                app:navigationIcon="@drawable/ic_search"
                app:popupTheme="?attr/toolbarPopupTheme"
                app:title="@null"
                tools:ignore="UnusedAttribute">

                <com.google.android.material.textview.MaterialTextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:id="@+id/appNameText"
                    android:textAppearance="@style/TextViewHeadline6"
                    android:textStyle="bold" />
            </androidx.appcompat.widget.Toolbar>

            <ViewStub
                android:id="@+id/cab_stub"
                android:layout_width="match_parent"
                android:layout_height="@dimen/toolbar_height" />
        </FrameLayout>
    </com.google.android.material.appbar.AppBarLayout>

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/fragment_container"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:defaultNavHost="true"
        app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior"
        app:navGraph="@navigation/library_graph" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>